Features:

• 3-ply cutting edges prevent cutters broken even in heavy-duty use.
• 25mm effective length enables cutting ranging from thick steel sheet to thick metal pipes with curved surface.
• The abrasion reducing design increases its durability with easier and faster cutting capability.
• Ejector spring,  pilot drill bit and screw are fixed together for all diameters

Specifications:

• 7pcs of hole saws: 19mm,22mm,25mm,29mm,35mm,44mm,51mm; 3/4″, 7/8″, 1″, 1-1/8″, 1-3/8″,  1-3/4″, 2″
• 2pcs of pilot bits
• 1pc or arbor
• 2pcs of hex keys
• Other specifications and packages are also available