this 3 piece set has longer (72mm, 65mm, 65mm) heavy duty adapters with 72 Nm torque rating. This set is stronger than regular 50mm long 3Pc sets. This 3pc set is a great tool addition to any tool box set with many uses for DIY, automotive repairs, household maintenance, and most general repairs. Suitably fit in many devices: power drills, impact wrench, hand held driver, and screwdriver handle tools (hexagonal hole or normal three-jaw chuck cad). Change your hand socket set into a power drive socket set. Turns power drill into high speed nut driver wrench with these 3 most common size 1/4", 3/8", and 1/2" inch square head drives. The spring-loaded ball lock on each square head securely locks into sockets to avoid slippage while using.