Features: 1.This is a HSS steel step cone drill titanium bit hole cutter. 2.Made from high quality HSS steel,anti-rust and durable. 3.With the Titanium coated to reduce friction and heat. 4.Easy to install and use. 3.It is very suitable for using to cut holes in a variety of materials including steel,brass,wood,plastic,etc. Descriptions: 1.This is a HSS steel step cone drill titanium bit hole cutter. 2.These step drill bits are ideal for variety of materials from metal, plastic, fiberglass to wood Specifications: Size (optional): 4-32mm, 4-20mm, 4-12mm,1 set(4-32mm+4-20mm+4-12mm) Color:Gold Handle type:Hex handle Handle diameter:6.35mm Total length:67mm/2.61in, 77mm/3in, 102mm/3.98in Weight:20g/ 46g/ 151g Materail: HSS High Speed Steel ​Coating: Titanuim Package Informations: Package Size:150x100x50mm/5.85x3.9x1.95in Package weight:220g/7.7oz Cloth bag Package(1 set) Polybag Package(1 pc) Package Included:(optional) 1 x Step Drill Bits Noted: 1.Please allow 1-2mm errors due to manual measurement. 2.Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same.