• Model NO.：Hard Rock Drilling Cross Bits
• Diameter：28mm 30mm 32mm 34mm 36mm 38mm 40mm 42mm 45mm
• Color：Red, Blue, Golden, Yellow
• OEM and ODM：Yes
• Certificate：ISO2000
• Processing Type：Forging
• Mining Object：Coal Machinery
• Transport Package：Plywood Box or Carton
• Specification：as per order quantity
• Trademark：Bestlink
• Origin：China
• HS Code：82071990
• Production Capacity：20000PCS Per Month

DescriptionDiameterLengthWater holeTaper degree a=4°  6° 7° 11° 12°
Socket inside diameter d=15, 19, 22, 25mmmm2206522365225692286023055 5823255 64 71 8023471 80236742387424074242742

B. Tapered cross bits
The taper cross bits can be used under any rock drilling condition because of it's comprehensive adaptability. Compared with taper chisel bits, taper cross bits have a better drilling performance because carbide tips on cross bits doubled, which means carbides shape are cross type on drill bits. Taper cross bit is mainly used for hard or very hard rock formation.  
 
DescriptionDiameterLengthWeightTaper degree a=4°  6° 7° 11° 12°
Socket inside diameter d=19, 22, 25mmmmKG2871 800.22971 800.23050 67 71 800.33251 67 71 800.33371 800.3234 67 71 800.3435 67 71 800.353671 800.3638 67 71 800.424071 800.434269 800.47

C. Tapered button bits 
Comparing with tapered chisel bits and tapered cross bits, button bits has higher technology, much longer primary drilling time and higher drilling efficiency, so that the button bit is popular among the users.
According to the tungsten carbide insert, tapered button bits can be divided into the types of hemispherical button, conical button and parabolic button, etc.
Button bits with hemispherical button is for high bearing capacity and abrasive resistance while conical button and parabolic button are for high drilling speed and low abrasive resistance. 
 DescriptionDiameterLengthButton NoTaper degree a=4°  6° 7° 11° 12°
Socket inside diameter d=19, 22, 25mmmmpcs2850429504 5 6 73050 805 6 7 83250 55 71 806 7 8 93350 55 71 806 7 93450 557 83550 71 804 5 6 73650 55737554 6 73850 554 6 74050 55 71 5 6 742506 7