T304 Stainless Steel precision centerless ground to fit exactly inside a SD TACTICAL D TITANIUM TUBE. THESE TUBES ARE LARGER IN ID THAN A MAGLITE. We take a length of tubing, then centerless grind it to the exact size (snug fit) 1.353 OD. Ready for you to cut into lengths that you desire. BE SURE TO MEASURE YOUR SD TUBE SINCE THEY HAVE BEEN KNOWN TO VARY IN SIZE. LATELY SOME HAVE HAD AN ID WHERE THE MAGLITE SLEEVE MATERIAL WOULD WORK BETTER.