Tapered drill rod and tapered bit. Tapered drill rod,another name called taper rod, tapered drill steels, This provides a hexagonal chuck section to provide leverage for the rotation chuck bushing. It usually has a forged collar to maintain the proper shank striking face position in the rock drill, and a tapered bit end. Tapered steel lengths— available from 0.6 mto 8.0 m in length—are measured from the collar to the bit end. Shank Hexagon: 19 x108 mm, 22x 108mm, 25 x108 mm,  25 mmX159 mm  , 7, 11, 12 degree taper in most lengths, taper degree of drill steel is mostly imports for excellent drilling productivity. For drilling medium-hard to hard and abrasive rock formations,Taper angles of 11 and 12-degrees are normally used on modern drill rigs, likeour model no. PD-Y58 crawler hydraulic rock drill. Also for Y6, Y10, Y24, YT24,YT 27,Mobile rock drill pneumatic and hydraulic. For low impact rock drills and softer rock formations, a narrow tape range of 7 degrees is used, such as Indian, Saudi’s granite and marble quarry. A comprehensive range of taper button bits, cross bits and chisel bits with 6, 7, 11, 12 degreetaper, drill hole diameter: 28mm-57mm. Taper button bit as small hole bit is different with thread button bit as long hole bit to use taper match with bit with rod to be used for air leg or hand held jack hammer driller in quarrying,and mining. Description : (1)Connect shank Size: Hex 22, Φ25 at most (2)Bit Diameter:Diameter 32mm,34mm,36mm, 38mm,40mm (3)Tapered connection: 6 degree, 7 degree, 11 degree, 12 degree etc. (4)Material︰Alloy Steel Bar 45CrNiMoV, Tungsten Carbide Tips YK05 or T6. (5)Button Shape︰ Ballistic Face Type︰ Flat Face; Bit Body︰Standard (6)Qty of button: 5,7, 8 pcs (7)main market: India, Saudi, Chile, South Africa,stone country consume too much