... to the number of disc can be divided into the single, double disc disc, three die and disc bit ... Bearing: rubber seal9,single drilling bit Suitable for: hard rock in10,single drilling bit Products: inventory, SizeBit-typeinmm8 1/2215.9LG415, ... LG435LG515,LG5359 1/2241.3LG415,LG435LG515,LG53512 1/2311.2LG415,LG435LG515 ...