Made from CR-MO steel,reverse thread spiral design for maximum grip.

To remove broken bolts and studs.

Contents:

5pc Twist Sockets,3/8" Dr. Sizes: 10, 12, 14, 16 & 19mm.

5pc Multi Spline Bits For Studs Screws Extractor Sizes:  2pcs 3/8"Dr. with size:4, 6mm; 3pcs 1/2"Dr. with size:8, 10, 12mm.

2pc Apdaptor 1/4" Shank: 3/8" & 1/2" Drives.