MM 3/8"Dr 17MM 6 Pt Deep Socket

Master Mechanic, 3/8" Drive 17 mm, 6 Point, Deep Well Socket, Chrome Vanadium Steel, Surface Drive Design Contacts The Flat Surfaces On Fastener Instead Of Corners, Reduces Slippage, Reduces Rounding Of Fastener & Will Still Grab On Slightly Rounded Fasteners.