Stafford Manufacturing Corp.s hinged shaft collars feature triple-link hinges and captive clamping screws. Designed for easy installation in tight spaces, the collars are ideally suited for applications requiring frequent repositioning and maintenance. They have a smooth bore for protecting expensive shafts, will not crush thin-wall tubing and can be modified with tapped holes on the face or OD for attaching sensors. Available in steel and two grades of stainless steel (including clamping screw), 25 sizes from 0.375-4.0 ID and 16 metric sizes from 6-50 mm. http://www.staffordmfg.comsales@staffordmfg.com