1 The flute is sharp and durable ,good chip breaking speed processing 2 Higher wear resistance and strength .High hardness high speed cutting 3 Large chip removal 4 Sharp cutting edge, reduce cutting force, lower breaking rate and improve the quality of hole wall.

Diameter D	R	Cutting Length	Shank Diameter	Overall Length	Flutes
3	0.5	8	3	50	4
3	1	8	3	50	4
3	0.5	8	4	50	4
3	1	8	4	50	4
4	0.5	10	4	50	4
4	1	10	4	50	4
5	0.5	13	5	50	4
5	1	13	5	50	4
6	0.5	15	6	50	4
6	1	15	6	50	4
8	0.5	20	8	60	4
8	1	20	8	60	4
8	2	20	8	60	4
8	3	20	8	60	4
10	0.5	25	10	75	4
10	1	25	10	75	4
10	2	25	10	75	4
10	3	25	10	75	4
12	0.5	30	12	75	4
12	1	30	12	75	4
12	2	30	12	75	4
12	3	30	12	75	4
14	0.5	45	14	100	4
14	1	45	14	100	4
16	0.5	45	16	100	4
16	1	45	26	100	4
18	0.5	45	18	100	4
18	1	45	18	100	4
20	0.5	45	20	100	4
20	1	45	20	100	4