Klein Tools SAE Impact Flip Socket Set 652QS 3 Piece Quad 8 (1 4 Hex Drive Deep Well Spring Loaded Steel Fastening Extension Kit) Coil Nailers Laser Etched Dimensional Callouts: Permanent size Laser Etched Dimensional Callouts: Permanent size markings and part numbers etched onto every shaft ensure instantaneous tool identification from the drawer or bench and fastener head shear in soft materials 11 16'' Hex Socket Point Profile Geometry 6 Point Deep Well Profile Fastener Transition Mechanism Hands Free Coaxial Spring Compression & Dual Flip Bodies Manufacturing Quality Standards ASME B107 Deep Well Access Geometry: Provides optimal depth clearance for long threaded studs