Innovatively engineered to easily extract even if they are stripped, rusted, or rounded. Specially designed to remove stripped, damaged and broken nuts, bolts, hex, screws,etc. Contents: 16pcs x 1/4""Dr: 6mm, 6.2mm, 6.5mm, 6.7mm, 7mm, 7.2mm, 7.5mm, 7.7mm, 8mm, 8.2mm, 8.5mm, 8.7mm, 9mm, 9.2mm, 9.5mm, 10mm. 13pcs x 3/8""Dr: 1/4'', 8mm, 3/8'', 10mm, 11mm, 12mm, 1/2'', 13mm, 14mm, 16mm, 17mm, 11/16'', 19mm. 1pc 3/8"" Hex Adaptor. 1pc 1/4"" Hex Adaptor. 1pc Knock Out Pin. Material: CRMO
eBay