1.Name:Roller kelly bushing 2.Type:heavy-duty,medium-duty,light-duty 3.a tool for drilling

Detailed product description

         Roller kelly bushing is a necessary tool for drilling, by matching with rotary square to drive kelly pipe. Through the rotation of four rolls,the friction between rolls and kelly pipes is reduced to extend service life.Change different rollers to match with different squares and hexagonal kelly pipes and connect with different rotary tables. Two transmission styles(square and pinconnect) are available. The size and dimentions are as follow:

Model	size	OD(in)
MSS	17 1/2	23/8-83/8
	20 1/2
	23
	27 1/2

Roller kelly bushing