1. It is made of high quality heat treated alloy steel for maximum strength. 2. 3-roller cones and 4-roller cones available.

The body of Hole Opener is made of high quality heat treated alloy steel for maximum strength. Cutter arms, equipped with removable cutter, are hard-faced and welded on body. The hole openers have three or six jet tubes with replaceable nozzles, so that jet streams quickly clean the enlarged hole. Our company have the following 2 kinds of fixed diameter hole opener: 3 roller cones hole opener and 4 roller cones hole opener.

Cutters on the hole opener are available in three types: type SM for soft to medium formation, type MH for medium to hard formation and type XH for hard formation.

Specifications of  Hole Opener

Type	Std. Hole open; mm	Qty. of Roller Cones	Mini. Pilot Hole; mm	Fishing OD.			Bottom Connection; API	ID. mm	Total Length; mm
				Length; mm	OD. mm	Top Connection; API
KZ311	311	3	216	457.2	203	6-5/8 REG	4-1/2 REG	38	1524
KZ-444	444.5	3	266.7	457.2	241	7-5/8 REG	7-5/8 REG	57	1752
KZ-660	660.4	3	444.5	457	241	7-5/8 REG	7-5/8 REG	76	1752
KZ-914	914.4	3	609.6	508	241	7-5/8 REG	7-5/8 REG	76	1905
KZ-914(4)	914.4	4	457.2	1092	254	7-5/8 REG	7-5/8 REG	89	2642

Hole opener