H4 Hexagon Shank 2.5mm 3mm 3.5mm 4mm 4.5mm 5mm 6 Points Hex Socket 6 in 1. Condition is New. Shipped with USPS First Class. Description: Hex socket:2.5mm,3mm,3.5mm,4mm,4.5mm,5mm. Mini size:28 x 5mm(L*D);Max size:28 x 7mm(L*D) H4 hex shank driver 6 point hex socket, a part of nut driver, can attached to a handle, used for tightening nuts and bolts. Can provide increased strength and avoid the rounding of rusted or damaged fasteners. An useful hand tool for car repairing in daily use.