Specifications and packaging - 11 pcs SDS hammer drill bit set - 9 Hammer Drill Bits (approx 5110mm, 6110mm, 8160mm, 10160mm, 12160mm, 14210mm, 16210mm, 18260mm, 22350mm) - 2 chisels (approx 1 Point Chisel 14250mm, 1 Flat Chisel 1425020mm) Durability - SDS plus hammer and chisel set features a harder YG8 carbide head and 45 carbon steel body - Delivers strong impact resistance, high hardness and toughness for longer tool life and faster masonry performance Function - Chisels made of strong 40Cr carbon steel - SDS chisels designed for use with a percussion drill to drill grooves in concrete, brick, natural stone and all types of masonry Drilling sharp - Electric hammer drill with cross alloy cutter head design; hard and durable with sharp drilling performance - Drilling is easier, improving work efficiency - Enhanced 4-slot design effectively prevents the bit from falling off during use Use scenarios - Install electrical outlets or run wiring channels in concrete or masonry walls - Drill anchor holes in concrete or brick for mounting shelves, fixtures or supports - Create grooves in concrete or natural stone for plumbing, tiles or renovation work