Apex 1/4” Socket And Ratchet Wrench Adapter, Metric Description Apex socket and ratchet wrench adapters have hex tolerances that are on average 48% tighter than DIN and 35% tighter than ANSI requirements. All Apex socket and ratchet wrench adapters have the tightest tolerances for straightness and concentricity in the industry. Quality design and construction give Apex socket and ratchet wrench adapters a long service life and durability. Apex socket and ratchet wrench adapters are not to be used with impact drivers.