Master Mechanic 213556 Metric Deep Well Socket 6-Point 1/4 In. Drive 4mm - Quantity 10

Master Mechanic 1/4 Drive 4 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.