1.The drill bit is made of high quality S2 alloy steel ,with sturdy hardened & tempered construction.which is durable and suitable for industrial use.2.include 12 Pack Hex Head Sizes SAE: 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32", 1/4", 5/16" and one Quick Release Bar.3.include 11 Pack Hex Head Sizes Metric: 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 5.5mm, 6mm, 8mm, 10mm, 12mm.4.The drill bit can be inserted into any 1/4 inch hex shank power drill and hand tool.Strong magnetic, high precision.5.widely used for household tool repairs. drill bits can also be used in many other protected parts. 11 Pack Hex Head Sizes Metric: 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 5.5mm, 6mm, 8mm, 10mm, 12mm. 12 Pack Hex Head Sizes SAE: 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32", 1/4", 5/16" and one Quick Release Bar. Precise 1/4 Inch Hex Shank and magnetic tips. Read more quick change extension rod set, interface permanent magnet, firm bit when working, will not fall off. widely used for household tool repairs. drill bits can also be used in many other protected parts. with bits rack，better storage. Read more
