Package Content: 12 Sizes Diamond Drill Bits (6/8/10/12/14/16/18/22/26/32/40/50mm) + 1 x Adjustable Hole Saw Drill Guide Jig Fixture. Helps to guide hole saw or drill bit to drill clear holes on tile, glass, marble, countertop, , etc. Sturdy & Strong: These diamond drill bits are made of steel. The thickened diamond coating on the top provides excellent cutting strength for high-precision, smooth cuts without hemming for maximum drilling results Adjustable Hole Saw Drilling Guide Fixture with suction cup. Plates' maximum opening length is 3-1/4 inch, large enough to put in all sizes' hole saws. Removable , two modes (fixing 3 or 4 bearings) are , just flip the board Wide Application: This diamond-coated hole saw kit is suitable for drilling holes for Glass, Tile Bottles, Blocks Jars, Fiber Glass Porcelain Tile Ceramic, Mable, Light Stone Material:steel colour:Blue+black Package Contents: 1 * Hole Saw Guide Jig Fixture 12 * Diamond Coated Drill Bit (6mm, 8mm, 10mm, 12mm, 14mm, 16mm,