Hole saw diameter 100mm, cutting depth 20mm, carbide tipped with drill and ejector spring. The PROMAT multi-range design features carbide-tipped cutting edges that allow for repeated regrinding and a replaceable center drill. It is suitable for unalloyed steels and stainless steel, ideal for sawing flat material, pipe material, and curved surfaces. Overlapping holes are possible. The drill body measures 30mm with a cutting depth of 20mm, compatible with hand drills up to 6mm. Application note: Use high-quality cutting oil when sawing metals; do not use cutting oil when sawing cast iron, and add petroleum when sawing aluminum. Further technical information: Designed with drill bit and spring.