SPECTRUM Hinged type pin drive Master Bushing for 37½” - 49½” Rotary Table is conforming to API-7K specification for drilling operations. With the help of Insert Bowls, it is capable to handle Drill Collar, Tubing, and Casing ranging from 2-3/8” to 13-3/8”.It can be removed from the rotary table to pass large diameter bit and pipe connections directly through the Rotary table and it has all the performance features of a solid master bushing. It is used with optional insert bowl no. 1,2 or 3 to handle different sizes of tubular. The Master Bushing is suitable for the Oilwell Square Drive rotary table. Master Bushing is also equipped with retainer pins to prevent them from falling out when the hinges are opened.