to either the tapered outer walls of the slip segments or the tapered outer walls of the slip bowl to reduce cold working between the slip assembly and the slip bowl during drilling operations with reference to fig2 and 3 the slip bowl 20 comprises an arc or c shaped section 30 which forms a semi circular partially enclosed annular body the slip bowl is preferably cast from an alloy or low alloy steel such as cms 02 grade 150 135 steel or more preferably cms 01 steel or most preferred cms 02 grade 135 125 steel the section further includes an annular outer surface 36 and an upwardly tapered inner surface 38 the section is symmetric about a vertical axis 16 to form a central bore 35 for receiving the slip assembly 22 fig1 externally the outer surface 36 of the body section 30 is defined by a cylindrical shoulder 40 that outwardly extends from an upper portion of the section and a complementary reduced diameter outer cylindrical surface 42 as shown in fig1 the complementary outer surface 42 is received and confined within the central opening 18 and the shoulder 40 is received by a recess 17 in the central opening 18 and abuts a rotary table shoulder 15 such that the slip bowl 20 is effectively.