The BH Series of grinding mandrels are manufactured for BOTTOMING and SHOULDER grinding. These grinding pins have a back taper, recessed center, and grinding dust exit slots. Two types are provided. Type A for diameters .315″ to .473″ and Type B for sizes .591″ to 1.00″.
The pins are only available in 80/100 Grit Diamond.
PDF Specifications: Titan Diamond Bottoming Mandrels
Mirror Tube Viewing System Bulb (T-001.88.041)
FX - 3 Used for Ring Light if not using extra objective
Shaviv 151-19019 High Speed Steel Blade B-20 



