Technical specs:

size	Cutting Speed (m/min)
	STAL 1	STAL 2	STAL 3
4" (dia.105mm)	1.0~1.2	2.0~2.5	3.0~4.0
4.5" (dia.115mm)	1.0~1.2	2.0~2.5	3.0~4.0
5" (dia.125mm)	1.1~1.5	2.0~2.8	3.2~4.5
6" (dia.150mm)	1.3~1.8	2.0~2.8	3.5~4.5
7" (dia.180mm)	1.5~2.0	2.5~3.0	4.0~5.0
8" (dia.200mm)	1.6~2.0	3.0~3.5	4.0~5.0
9" (dia.230mm)	1.8~2.5	3.5~4.0	4.5~5.5

Size (diameter x tooth height)	Cutting Life (20mm Thickness Granite)
	Normal Bond		Long Life Bond
	Medium-Hard Granite	Soft-Medium Granite	Medium-Hard Granite	Soft-Medium Granite
105x8mm	75~85m	110~120m	150~160m	180~190m
115x8mm	80~90m	120~130m	155~165m	185~195m
125x8mm	85~95m	125~135m	160~170m	190~200m
150x8mm	125~135m	165~175m	125~135m	280~290m
180x8mm	145~150m	190~200m	280~290m	350~360m
230x8mm	215~225m	255~265m	400~410m	450~460m

update: Dec. 29, 2008