the listinbg is for grit 100 medium bond, it is used for ASL xingyi grinder. 
if you need hard bond or soft bond, please leave us a note after your order 

if you do not know which bond to choose, please refer to below. The “rule of thumb” to get you the best possible concrete is:  soft concrete requires hard bond diamonds and hard concrete needs soft bond diamonds; Metal Bond Tooling Guide: For Matching the Correct Diamond Bond Hardness to Concrete Hardness. Very Hard Concrete (6,000-8,000 PSI) ----------- Extra Soft Bond Diamonds Hard Concrete (5,000-6,000 PSI) ------------ Soft & Extra Soft Bond Diamonds Medium Concrete (3,500 – 5,000 PSI ) ------------ Medium Bond Diamonds Soft Concrete (3,500 PSI and under) ------------ Hard Bond Diamonds 1. Soft floor = Hard Bond Diamonds 2. Medium floor = Medium Bond Diamonds 3. Hard floor = Soft Bond Diamonds 4. Very Hard floor = Extra Soft Diamonds 


the base plate thick is 6.35mm as the photo. 

the hole distance is as the photo below