The chuck/drive system is a key component of these power drilling tools. Some system examples are “SDS”, “SDS Plus”, “SDS Max”, and “spline”. SDS, which in German is ‘Steck – Dreh – Sitz’ (translated ‘Insert – Twist – Stay’), was developed by Bosch in 1975 for hammer drills. SDS uses a cylindrical shank on the bit, with indents held by the chuck. SDS/SDS-Plus is a 10 mm shank with 2-4 open grooves held by the driving wedges, and two closed grooves held by locking balls. SDS-Max has an 18 mm shank with three open grooves and locking segments rather than balls. It is designed for hammers over 11lbs (5 kg). Spline drives are not as common in the marketplace, with a design of the spline drive providing more surface-grab for high-torque use.
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