... 1/2'' 3)processing:forging 4)sealing:metallic seal 5)MOQ:1pc Fitting1)7 7/8'' API speed droll ... Co., Ltd.ProductSizeIADC CODE TCI Tricone Bit3 7/8 ,5 1/2, 6 1/27 7/8,8 1/ ... 527 537617 637 737Steel Tooth Tricone Bit3 7/8 ,5 1/2, 6 1/27 7/8,8 1 ... 216 217 315 316 317 325 327PDC BIT(3 blades,4 blades,5 blades,6 blades)5 1/2, 6 1/27 7/8,8 ... 1/2,8 3/410 5/8,12 1/413 ...