OMS 144mm Twinning Band Bolt A16610412 OMS 144mm Long Stainless Steel Double Open Ended Bolt. Maufactured from 3162 Marine Grade Stainess Steel, designed for use in Sea Water. 144mm Length M8 - 8mm Metric Thread for use with Stainless Steel Cylinder Twin Set Bands for Cylinders up to 186mm in Diameter. Photo shows all Sizes available,115, 136, 144 & 163mm Lengths.