The Starrett SDS Plus 4 Point Drill Bit comes with high performance carbide tips and a cross head design for consistent performance. This head design provides 4 vertical debris removal channels for faster material penetration and maximum debris removal.The drill body offers superior strength thanks to its specialised heat treatment, enabling it to withstand the most demanding of applications. PGM certified. This Starrett SDS Plus 4 Point Drill Bit has the following specifications: Diameter: 20mm.Overall Length: 460mm.Working Length: 400mm.