What's in the box:

Bi-metal Hole Saw Kit 6Pcs Assorted Heavy-duty Hole Saw Set with 4 Saw Blades of 32/38/44/54mm, 1 Mandrel, 1 Hex Key for Metal Wood Plasterboard PVC Plastic Downlight (Red)

Constructed in aggressive tooth design, the saw delivers fast and clean cuts.

Features:
Applied for cutting on soft and hard materials like wood, alluminum, steel, plastic, cast metal, plasterboard, sheet stainless steel, etc.
Optimized tooth design with sharper teeth, the hole saw easily penetrates metal for faster cuts and chip removal.
The 6pcs kit comes with 4 hole saws of 32mm, 38mm, 44mm, and 54mm; a mandrel and a hex key.
Comes with a mandrel whose drive-end is 10mm (dia.) and drill-end is 6mm (dia.). Fits for most drills in the market.
Made from M42 bimetal steel, the saw is tough and high resistance for top performance. Thick walls for a longer lifespan.

Tips to Use
1. Continuously adding coolant when using the hole saw to avoid cracking the blade. Take gun-drill as example, try to reduce the speed of the dill when turning on/off.
2. Cut about 1mm in depth at first when handling the iron plate that is thicker over 5mm. And using spitting drill to cut a hole along the saw kerf for easy chip removal.

Specifications:
Material: M42 Steel
Color: Black / Red / Yellow (optional)
Chip Pocket Length: 10mm / 0.9in
Mandrel Length: 9cm / 3.54in
Mandrel Diameter: 10mm(drive-end); 6mm(drill-end)
Hex Key Size: 5*1.9cm / 1.96*0.74in
Item Size:
3.2*3.2*7cm / 1.25*1.25*2.75in
3.8*3.8*7cm / 1.49*1.49*2.75in
4.4*4.4*7cm / 1.73*1.73*2.75in
5.4*5.4*7cm / 2.12*2.12*2.75in
Item Weight: 210g / 7.4oz
Package Size: 21*12.5*3cm / 8.26*4.92*1.18in
Package Weight: 215g / 7.58oz

Packing List:
1 * 32mm Hole Saw
1 * 38mm Hole Saw
1 * 44mm Hole Saw
1 * 54mm Hole Saw
1 * Mandrel
1 * Hex Key