The MK Yellow is a standard grade core bit, and is an excellent choice for all kinds of general purpose wet core drilling. The MK Yellow produces fast drilling and has good footage.
The MK Orange is a premium grade bit engineered for wet core drilling applications that include moderate to light steel reinforcement. The high concentration of diamonds ensures excellent cutting speed and footage.
The MK Black is a supreme grade core bit designed for excellent footage and aggressive drilling speed. Excellent for your tough applications associated with high to moderate steel reinforcement.

Diameter*		Nut	MK-Black	MK-Orange	MK-Yellow
1/2 inch	13 millimeters	5/8"-11	156373	�	�
5/8 inch	16 millimeters	5/8"-11	157176	�	�
3/4 inch	19 millimeters	5/8"-11	156374	�	�
7/8 inch	22 millimeters	5/8"-11	156375	�	�
1 inch	25 millimeters	5/8"-11	156376	156348	156320
1-1/8 inch	29 millimeters	5/8"-11	157177	204011	104011
1-1/4 inch	32 millimeters	5/8"-11	156377	156349	156321
1-3/8 inch	35 millimeters	5/8"-11	156534	�	156965
1-1/2 inch	38 millimeters	5/8"-11	156378	156350	156322
1-5/8 inch	39 millimeters	5/8"-11	157178	�	�
1-3/4 inch	44 millimeters	5/8"-11	156379	156351	156323
2 inches	51 millimeters	1-1/4"-7	156380	156352	156324
2-1/4 inches	57 millimeters	1-1/4"-7	156381	156353	156325
2-1/2 inches	64 millimeters	1-1/4"-7	156382	156354	156326
2-3/4 inches	70 millimeters	1-1/4"-7	156383	156355	156327
3 inches	76 millimeters	1-1/4"-7	156384	156356	156328
3-1/4 inches	83 millimeters	1-1/4"-7	156385	156357	156329
3-1/2 inches	89 millimeters	1-1/4"-7	156386	156358	156330
4 inches	102 millimeters	1-1/4"-7	156387	156359	156331
4-1/4 inches	108 millimeters	1-1/4"-7	156388	156360	156332
4-1/2 inches	114 millimeters	1-1/4"-7	156389	156361	156333
5 inches	127 millimeters	1-1/4"-7	156390	156362	156334
5-1/2 inches	140 millimeters	1-1/4"-7	157628	157627	�
6 inches	152 millimeters	1-1/4"-7	156391	156363	156335
6-1/4 inches	159 millimeters	1-1/4"-7	156392	156364	156336
6-1/2 inches	165 millimeters	1-1/4"-7	156393	156365	156337
7 inches	178 millimeters	1-1/4"-7	156394	156366	156338
8 inches	203 millimeters	1-1/4"-7	156396	156368	156340
9 inches	229 millimeters	1-1/4"-7	156397	156369	156341
10 inches	254 millimeters	1-1/4"-7	156398	156370	156342
12 inches	305 millimeters	1-1/4"-7	156399	156371	156343
14 inches	356 millimeters	1-1/4"-7	156400	156372	156344
Drilling Depth			14 inches