国产精品不卡av在线观看,久久综合九色综合欧美狠狠,又粗又长又硬义又黄又爽,久久精品国产欧美激情无码

Model

Outer diameter of heel tube  mm

Inner diameter of heel tube  mm

Reaming size  mm

Minimum diameter of inner hole of tube shoe mm

Maximum diameter of drill bit that can pass through mm

With impactor

ZRHG168

168

148-155

184

140

140

ZRC5 series

ZRHG178

178

158-165

194

148

148

ZRC5 series

ZRHG183

183

163-170

198

156

156

ZRC5 series

ZRHG219

219

199-206

231

188

188

ZRC6 series

ZRHG273

273

251-257

300

241

240

ZRC8 series

Characteristics of ZRHG series of tubular drilling tools

For the development of the ground source water well market, it has simple structure, high efficiency, high hole straightness and high precision, which saves a lot of cost for customers.