This  products is named 6PC woodworking hole saw sets. It is a kind of simple instrument,  powered by hand electric drill and drill machine, can process large aperture round hole on board and plastic plate. The twist drill is settled at the central axis of cylinder saw, the top of twist drill is higher than cylinder serrated over 5mm. While processing, twist drill fix the central, and the saw process round hole. You only need cutting a small amount, it saves labor and processes efficiently. 

Name: 6PCS wood hole saw Kit

Contains: 4PCS wood Hole saws: 1 1/4 "(32mm) # 1 1/2" (38mm) # 2 "(51mm) # 2 1/8" (54mm)

1PCS hole saw pole

1PCS Allen wrench

Case Pack: 60 SETS

Name: 6PCS wood hole saw Kit

Contains: 4PCS wood Hole saws: 32mm 38mm 44mm 53mm

1PCS hole saw pole

1PCS Allen wrench

Case Pack: 60 SETS