Bi-Metal Hole Saw set 11 Pieces 19-68 mm, HSS M42 with 8% Cobalt, 38 mm Drilling Depth, 4/6 TPI, Adapters, Pilot Bit, Plastic Case, Proline

Quick Facts

• Hole Saw Set Bi-Metal 11 Pieces 19-68mm, HSS M42 Cobalt, Adapters, Pilot Bit
• Category: Tools
• Brand: Proline
• Model Number: 27490
• Material: HSS M42 with 8% cobalt, alloy spring steel
• Number of Hole Saws: 11 pcs
• Sizes: 19, 22, 25, 32, 35, 40, 44, 51, 60, 64, 68 mm
• Tooth Pitch: 4/6 TPI variable
• Drilling Depth: 38 mm
• Mount: Hexagon or SDS-plus adapter
• Included: 2 adapters, pilot bit, hex key, bushing
• Package: Plastic case

Specifications

What is the difference between HSS M42 and regular HSS?

HSS M42 contains 8% cobalt which provides significantly higher hardness, better heat resistance, and longer service life, especially in stainless steel and harder materials.

Why is cobalt important for stainless steel?

Stainless steel is much harder and generates more heat when drilling. Cobalt increases both hardness and heat resistance making the hole saw more efficient and durable.

Is this set worth the extra cost compared to M3?

Yes, if you drill in stainless steel or other harder materials. M42 lasts significantly longer and drills faster in tough materials.

What speed should I use for stainless steel?

Use low speed, high feed rate, and plenty of coolant. Stainless steel requires patience and proper technique.

Can I use the same adapters as for other hole saws?

Yes, the set includes standard adapters that fit most drills with hexagon or SDS-plus chuck.