16Pc Hole Saw Kit.  Great item for plumbers and electricians!  Cut smooth, clean, accurate holes through up to 1" thick drywall, wood and plaster.
 
Kit Includes:
 
Imperial
12 Steel Cutting Cups - sizes: 3/4", 7/8", 1", 1-1/4", 1-1/2", 1-3/4", 2", 2-1/2", 3", 3-1/2", 4", 5".
13/8" Mandrel
11/4" Pilot Drill Bit  (2" Long) with Mandrel
1 x Drive plate
1 x Allen Key
 
Metric
12 Steel Cutting Cups - sizes: 19, 22, 29, 32, 38, 44, 51, 64, 76, 89, 102, 127mm
1 x Pilot Drill 6mm Thick & 60mm Long
1 x Allen Key 2.5mm