Bi-metal hole saws:
(x1) 3/8" Hex HSS adaptor Ø22-35mm
(x1) 7/16" Hex HSS adaptor Ø44-64mm
(x1) Hex key for replacing pilot drill bit
(x1) Adaptor 1/2-20UNF - 5/8-18UNF
The Bi-metal hole saw's fast cutting power lies behind its HSS (hi-speed steel) manufactured teeth.
The teeth have been set to a variable pitch to improve harmonic vibration and to have a better chip clearance.
The hole saw can be used to cut into:
Mild steel (sheet metal)
Stainless steel (sheet metal)
Drywall (plaster board)
An auger drill bit is used to bore holes in timber. It is great for drilling holes in thatch poles to insert threaded rods.
The design is very similar to a forstner drill bit, as it "shaves" itself through the wood. A low rpm rotary drill with a planetary gearbox is required to be used with auger drill bits.