In the process of sewing machine,Rotary Hook, with 7.24mm aperture, spins in low speed and is suitable to different kinds of inland intermediate speed industrial lockstitch sewing machine, such as 、GC1-l、GC1-2 、GC1-3、GC2-2、GC5-1. Homemade type 96 intermediate-speed Rotary Hook can also cooperate with all kinds of intermediate speed sewing machine from SHENGJIA 95-40, 96-40; JUKI TR-7, TL-72, DDL; Mitsubishi DB32-10, DX370-10; DURKOPP ADLER 206, 207, 270.