Spline profile 15° angled long wall offset-ring ratchets for aeronautical fasteners. Thin wall and long profile for maximum accessibility. Wrenches used in engine assembly and maintenance. The spline profile applies more torque with less strength as the tightening contact surface is higher. The contact points of a Spline wrench are always far from the nut's angles. This limits wear of the nuts. The Spline profile ensures high versatility. It is compatible with Spline, Torx, 4-, 6- and 12-point fasteners. Spline sizes: from 7 to 32 Black phosphate finish.