Hollow Round Shank Multi BitNut Driver Tip Size 1/4 in 5/16 in 11/32 in 3/8 in 7/16 in 1/2 in 9/16 in Bolt Clearance 4 in Shank Length 4 in Ergonomic SAE Hollow Round Multi Bit Fastener Holding Yes For Fastener Size 1/4 in 31/100 in 17/50 in 19/50 in 11/25 in 1/2 in 14/25 in ESD Safe No Insulated No Magnetized Tip Yes Non-Magnetic No