<https://superiortoolservice.com/shop/38-100-carbide-microstop-countersink-w-tdr-pilot/#product>
<http://schema.org/description>
"3/8\" dia. solid carbide microstop countersink and 4 flute and 100 degree included angle and 1/4-28 threaded shank with 1/2\" long integrated tapered drill reamer pilot and note your pilot diameter when ordering. SKU: 370-375-100"
<https://superiortoolservice.com/shop/38-100-carbide-microstop-countersink-w-tdr-pilot/>