This year ,we have R&Ded successfully a new technic on drill.Under this technic,the drills have many new characters,they are: 1)the welded intensity(between the segment and the tube) is super( up to 30NM),the segment quality is improved dramatically which solved the segment broken. 2)the performance of the drill is precise.(to see the picture ) At present ,The below items are available:(the length is available on the buyer's enquiry) Ф27, Ф32, Ф38, Ф46, Ф51, Ф56, Ф63, Ф83, Ф102, Ф112, Ф132,Ф25.Ф30. Ф36. Ф40. Ф44. Ф66. Ф71. Ф76. Ф89. Ф96. Ф108. Ф110. Ф120. Ф122. Ф127. Ф152. Ф159. Ф162 and so on. The thread is available on the buyer's enquiry.After all we have a professional technical team dealing in the R&D new products.