Size	Diameter	Cutting thickness
	Size	D（mm)	H(mm)	2a（mm)
	1/4X1/4	6.35	6.35	90°
	1/4X5/16	7.96	7.96	90°
	1/4X3/8	9.52	9.52	90°
	1/4X1/2	12.70	12.70	90°
	1/4X5/8	15.90	15.90	90°
	1/4X3/4	19.05	17.50	90°
	1/4X7/8	22.20	22.20	90°
	1/4X1	25.40	25.40	90°

Note that the shank diameter of each model is 6.35mm