GearWrench KDT9416 16 Pc. Metric Combination Ratcheting SetKDT9416 Description. Sizes include 8 Ð 19, 20, 21, 22, 24mm. Surface Drive¨ – Reduces fastener rounding. Sleek head design enables access to tight spots where a ratchet will not fit. Ratcheting Box-End needs as little as 5¡ to move fastener vs. 30¡ for standard box end wrenches Weight: 6.67 lbs. Add to Favorite Sellers. Metric Combination Ratcheting Set. Sizes include 8 Ð 19, 20, 21, 22, 24mm. Surface Drive¨ – Reduces fastener rounding. Sleek head design enables access to tight spots where a ratchet will not fit. Ratcheting Box-End needs as little as 5¡ to move fastener vs. 30¡ for standard box end wrenches.