| 摘要 |
The auxiliary device (10) for the building sector has a cylindrical body (11) which ends in a mushroom head (12) at one end and has a concentric through-channel (13). Arranged in the concentric through-channel (13) is a screw bolt (16) as an adjustable stop part for a tool shank (17) which can be inserted into the through-channel (13) and is held by a clamping ring (18). The mushroom head (12) of the auxiliary device (10) exhibits slit-like edge incisions. <IMAGE>
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