Solid Round Shank PrecisionNut Driver, Tip Size 4.5 mm, Bolt Clearance 5/16 in, Shank Length 2 5/16 in, Tapered, Metric, Solid Round Precision, Fastener Holding No, For Fastener Size 4 mm, ESD Safe Yes, Insulated No, Magnetized Tip No, Non-Magnetic Yes