45mm Diamond Tip Hole Saw Bit - Can be used for 1" bulkheads

45mm (approx. 1 3/4") diamond tip hole saw for 1" bulkheads. Hole sizes for the bulkheads: 3/4" Bulkhead: 1.5" (38 mm) Diameter 1" Bulkhead: 1.75" (45 mm) Diameter 1 1/4" Bulkhead: 2" (50 mm) Diameter 1 1/2" Bulkhead: 2 3/8" (60 mm) Diameter ** If you do not have experience drilling holes in an aquarium, please go to YouTube and search for "drilling holes in glass aquariums". There are many informative videos which will help your projects.***