18. SEGMENT INFORMATION The Company has two operating segments, which are also its reportable segments. The Company's operating segments are organized based upon primary market channels and, in most instances, the end use of products. Through its Electrical Raceway segment, the Company manufactures products that deploy, isolate and protect a structure's electrical circuitry from the original power source to the final outlet. These products, which include electrical conduit, armored cable, cable trays, mounting systems and fittings, are critical components of the electrical infrastructure for maintenance, repair and remodel markets. The vast majority of the Company's Electrical Raceway net sales are made to electrical distributors, who then serve electrical contractors and the Company considers both to be customers. Through the MP&amp;S segment, the Company provides products and services that frame, support and secure component parts in a broad range of structures, equipment and systems in electrical, industrial and construction applications. The Company's principal products in this segment are metal framing products and in-line galvanized mechanical tube. Through its metal framing business, the Company designs, manufactures and installs metal strut and fittings used to assemble mounting structures that support heavy equipment and electrical content in buildings and other structures. Both segments use Adjusted EBITDA as the primary measure of profit and loss. Segment Adjusted EBITDA is the sum of income (loss) before income taxes, adjusted to exclude unallocated expenses, depreciation and amortization, interest expense, net, restructuring charges, stock-based compensation, certain legal matters, transaction costs and other items, such as inventory reserves and adjustments, release of indemnified uncertain tax positions, and the impact of foreign exchange gains or losses. Intersegment transactions primarily consist of product sales at designated transfer prices on an arm's-length basis. Gross profit earned and reported within the segment is eliminated in the Company's consolidated results. Certain manufacturing and distribution expenses are allocated between the segments on a pro rata basis due to the shared nature of activities. Recorded amounts represent a proportional amount of the quantity of product produced for each segment. Certain assets, such as machinery and equipment and facilities, are not allocated to each segment despite serving both segments. These shared assets are reported within the MP&amp;S segment. We allocate certain corporate operating expenses that directly benefit our operating segments, such as insurance and information technology, on a basis that reasonably approximates an estimate of the use of these services. Three months ended December 27, 2019 December 28, 2018 (in thousands) External Net Sales Intersegment Sales Adjusted EBITDA External Net Sales Intersegment Sales Adjusted EBITDA Electrical Raceway $ 340,788 $ 588 $ 70,193 $ 343,215 $ 191 $ 68,489 MP&amp;S 106,660  16,654 108,813  10,887 Eliminations  (588 )  (191 ) Consolidated operations $ 447,448 $  $ 452,028 $  Presented below is a reconciliation of operating segment Adjusted EBITDA to Income before income taxes : Three months ended (in thousands) December 27, 2019 December 28, 2018 Operating segment Adjusted EBITDA Electrical Raceway $ 70,193 $ 68,489 MP&amp;S 16,654 10,887 Total 86,847 79,376 Unallocated expenses (a) (9,137 ) (9,353 ) Depreciation and amortization (18,730 ) (18,021 ) Interest expense, net (10,620 ) (12,160 ) Restructuring charges (220 ) (1,387 ) Stock-based compensation (3,123 ) (2,982 ) Transaction costs (51 ) (164 ) Other (b) (2,836 ) (206 ) Income before income taxes $ 42,130 $ 35,103 (a) Represents unallocated selling, general and administrative activities and associated expenses including, in part, executive, legal, finance, human resources, information technology, business development and communications, as well as certain costs and earnings of employee-related benefits plans, such as stock-based compensation and a portion of self-insured medical costs. (b) Represents other items, such as inventory reserves and adjustments, release of indemnified uncertain tax positions and the impact of foreign exchange gains or losses. The Company's net sales by geography were as follows for the three months ended December 27, 2019 and December 28, 2018 : Three months ended (in thousands) December 27, 2019 December 28, 2018 United States $ 396,141 $ 395,628 Other Americas 6,586 9,232 Europe 33,309 33,862 Asia-Pacific 11,412 13,306 Total $ 447,448 $ 452,028 The table below shows the amount of net sales from external customers for each of the Company's product categories which accounted for 10% or more of consolidated net sales in either period for the three months ended December 27, 2019 and December 28, 2018 : Three months ended (in thousands) December 27, 2019 December 28, 2018 Metal Electrical Conduit and Fittings $ 123,842 131,247 Armored Cable and Fittings 83,823 84,345 PVC Electrical Conduit and Fittings 72,888 68,233 Cable Tray and Cable Ladders 50,246 45,774 Other raceway products 9,989 13,616 Electrical Raceway 340,788 343,215 Mechanical Pipe 58,331 60,668 Other MP&amp;S products 48,329 48,145 MP&amp;S 106,660 108,813 Net sales $ 447,448 $ 452,028