Koken 1 2" Dr Internal Torx Socket Set On Rail 7pc E10 E24 Impact Socket Sets Set contains: 4 Flat Set contains: 4 Flat : 3 02mm Long Jaw style Vernier Caliper Long Jaw Vernier Caliper Long jaws for measuring hard to reach workpiece features The jaws have rounded measuring faces for accurate inside diameter measurement Inside and outside measurements can be read directly from the upper and lower vernier scales RS4425 Internal Torx Socket Set On Rail 7pc 1 2"Dr E10 E24Torx is recognized as the most efficient fastening system because of their ability to transfer greater torque reduce end load and virtually eliminate tool slippage