Material: High Speed Steel (HSS).

Applicable materials: Attach to electric drills and drill holes in iron, aluminum, gypsum board, plastic, metal alloy, bimetal, styrorol, wood, steel, stainless steel, copper, brass, aluminum, fiberglass, etc.

Outer Diameter: 16mm / 0.62", 18.5mm / 0.72", 20mm / 0.78", 25mm / 0.98", 30mm / 1.18" Round Duct Can be easily cut to positionWe offer 5 different size hole saw to meet your different needs.

High precision and smooth drilling.And it is especially high impact and abrasion resistance. Can be applied to stainless steel, iron, aluminum, wood and a variety of tubes. Can be applied to stainless steel, iron, aluminum, wood and a variety of tubes.