Bore and lowering device has lowering body with cutting tooth and support for fixing lowering body on spiral bore, where stopper is provided with support for inserting on lowering body

摘要

The bore and lowering device has a lowering body (1) with a cutting tooth (2) and a support for fixing the lowering body on a spiral bore (3). A safety screw (6) is arranged in a side wall of the lowering body, which is brought in contact with the spiral bore. A stopper (4) is provided with the support for inserting on the lowering body.