drill collar with 2 81 1 bending strength ratio

{"cid":"91217788","title":"7-5\/8 REG Drill Collar 9-1\/2 Inch Outside Diameter 2.81:1 Bending Strength Ratio in Oil and Gas Industry","imgUrl":"https:\/\/img.chinax.com\/nimg\/85\/30\/1ee856dc910909b8dd9b166214e5-200x200-1.jpg","attrs":{"Price":"1000-3000","Brand Name":"SWS","Minimum Order Quantity":"1PCS","Payment Terms":"L\/C, D\/A, D\/P, T\/T, Western Union, ","Product name":"Drill Collar","Number and Connection Table":"7-5\/8 REG","Outside Diameter(Inch)":"9-1\/2","Outside Diameter(mm)":"241.3","Inside Diameter(Inch)":"3","Inside Diameter(mm)":"76.2","Length(mm)":"9150 or 9450","Bevel Diameter(mm)":"223.8","Bending Strength Ratio":"2.81:1"}}