1.Specifications and packaging: 11 pcs SDS hammer drill bit set. The set includes: 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). 2. & Durability: The SDS plus hammer and chisel set features a harder YG8 carbide head and 45 carbon steel body, strong impact, high hardness and toughness for longer tool life and faster masonry performance. 3.Function: These chisels are made of strong 40Cr carbon steel and SDS chisels are used with a percussion drill to drill grooves in concrete, brick, natural stone and all types of masonry. 4.Drilling sharp: Our electric hammer drill with cross alloy cutter head design, hard and durable, drilling sharp, drilling easier, improve work efficiency. The enhanced 4-slot design effectively prevents the bit from falling off more ly and quickly.