Features: Wobble extension set is designed to link with fulcrum, to provide stronger warping force. This wobble socket extension set has the strength to loosen stubborn fasteners without twisting or bending. Spring-loaded detent balls securely latch onto sockets, preventing them from being dropped or left sticking on fasteners. This combination wobble extension set has a variety of drive sizes and lengths, giving this item the benefit of getting a firm grip to fasteners hard to reach. This socket extension set is a two way wobble extension set. it should be inserted partially into sockets for the wobble feature for confined areas. it should be inserted fully into sockets for regular use. Specifications: Type: Socket Ratchet Extension Bar Material: Chrome Vanadium Steel ( CR-V ) Drive Square Size: 1/4 Inch (6.35mm) System: Metric Size: 1/4 inch 6.35mm driver 50mm length 1/4 inch 6.35mm driver 75mm length 1/4 inch 6.35mm driver 100mm length 1/4 inch 6.35mm driver 150mm length 3/8 inch 9.5mm driver 75mm length 3/8 inch 9.5mm driver 150mm length 3/8 inch 9.5mm driver 250mm length 1/2 inch 12.5mm driver 75mm length 1/2 inch 12.5mm driver 150mm length 1/2 inch 12.5mm driver 250mm length Package Includes: 4 x 1/4" Drive Extension Bars 3 x 3/8" Drive Extension Bars 3 x 1/2" Drive Extension Bars Notes: 1. Size for manual measurement, there may be a 1 to 3 mm error, belongs to the normal phenomenon. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!