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...gypsum board expansion screw hollow brick expansion bolt hollow wall special expansion bolt Product Description We have all standard DIN, BS, JIS and ISO fasteners and other industrial parts with well-equipp...
...~40 Weight on Bit(KN/MM) 0.5~1.2 Formation Hard formation with high compressive strength ,such as limestone,sandstone,dolomite,hard gypsum,marble,etc. Cutting Structure The wear-resistance of the teeth is...