The Fixed Diameter Hole Openers are made 0f tough heat treated alloy steel for maximum strength?DCutter arms are hardfaced and welded 0n body?Dequipped with removable cutters?DCutters are available in three types?type SM for soft to medium formation?Dtype MH for medium to hard formation and type XH for hard formation.The hole openers have three or six jet tubes with replaceable nozzles?Dso that jet streams quickly clean the enlarged hole?D On inquiries and orders please specify?o 1 Hole size 2 PiIOt hole size 3 Top and bottom connections 4 Fishing neck and bottom neck length and OD?D 5 Types of cutters(SM?DMH?DXH)