This K-Tool XD product comes with a patented 120 tooth design which is excellent for tight working space Extra long, flexible and reversible making it the most versatile set of ratcheting wrenches on the market The 180° rotating head on both ends of the wrench allows the ratchet wrench flexibility to bypass obstacles for easy use at any angle Innovative internal gear mechanism and spherical profile (Spline Plus) makes this one of the best performing ratcheting wrenches available Sizes included: 8 x 10mm (KTIXD1208X10), 12 x 14mm (KTIXD12012X1, 13 x 15mm (KTIXD12013X15), 16 x 18mm (KTIXD12016X18), and 17 x 19mm (KTIXD12017X19)