19PCS BI-METAL Hole Saws for Cutting wood, Plastic, thin Metal, Fiberboard

Specifications:
-- Material: M42 high-speed steel & bi-metal
-- Cutting Depth: 1-1/2inch / 38mm
-- Large Arbor Shank Dia: 1/2" / 12.5mm
-- Small Arbor Shank Dia: 3/8"
-- Drill Bit Dia: 1/4inch / 6mm
-- Allen Wrench: 5/32inch / 4mm

What You Get:
13 pcs size saw blades: 19mm/ 3/4'' , 20mm / 22/25'' , 22mm / 7/8'', 25mm/ 1'' , 35mm/ 1-3/8'' , 29mm/ 1-1/8”, 32mm/ 1-1/4”, 38mm/ 1-1/2'' , 44mm/ 1-3/4'' , 51mm/ 2'' , 57mm/ 2-1/4'' , 64mm/ 2-1/2'', 76mm/ 3”
2×Arbors
4×Pilot Bits
1×Hex Keys
1 x Adapter
A Sturdy Plastic Carrying Case

Use Step:
1.Installing guide holes and hole saws.
2.Hold the drill pen until the cutting surface and rotate clockwise.
3.When drilling starts, cut at a slow speed and maintain a steady pressure.
4.The hole saw then cuts out the hole immediately.

Note:
-- Hole saw may become overheated and get damaged or even burned up due to fast rotary friction, we suggest customers to use coolant (Not Includes) to keep the hole saw cold during usage.
-- Holding the drill straight to the cutting surface, and drill as clockwise rotation.
-- Keep the drill be stable when drilling, otherwise, the center bit may get snapped due to excessive shaking.
-- Start drilling with a slow drill rotary speed, or the center bit may be shattered on first use.