The deep hole drills are designed with paralollc type cutting edge body clearance to removed and allow excellent coolant flow. It can be used for cutting deep hole which the ratio of hole deep to hole diameter is 20 once. 1¡¢H-M type 100 deep hole drills are suitable for drilling heavy alloy. 2¡¢H-L50 deep hole drills are suitable for drilling light alloys. including aluminium.alnminium alloys.brass.brass alloys.zinc.zinc alloys.The bit is thinned with S type. 3¡¢H Strong force deep hole drills are suitable for drilling QT iron cast. We can manufacture tools according to customer's requirements. The overall length is below 2000mm. On order please specify name.diameter overall length.flute length.