3pcs 50mm 65mm 6.35mm chrome vanadium steel socket adapter set hex shank to 1/4" 3/8" 1/2" extension drill bits bar hex bit s

specifications: size: inch length 1/4''*1/4''*50mm--1/4'' shank can be converted into 6.35 mm square 3/8''*1/4''*50mm--1/4'' shank can be converted into 9.53 mm square 1/2''*1/4''*50mm--1/4'' shank can be converted into 12.7 mm square material: chrome vanadium steel cr-v quantity: 1 set(3pcs)