Question: what are sds plus drills?
Answer: SDS-plus is the most common by count of tools manufactured, with masonry drills from 4 mm diameter to 30 mm (and from 5/32" to 1-1/4") diameter ordinarily available. The shortest SDS-plus masonry drill bits are about 110 mm overall length, and the longest 1500 mm. ... The SDS bit was developed by Hilti and Bosch in 1975.