Now you can Barrel Trim any Pen Kit with any tube size with this top quality Barrel Trimming Sleeve Set. This 9 sleeve set gives you the ability to perfectly trim virtually any tube size using either a 7mm barrel trimmer or the PSI Pen Blank Squaring Jig. Slide the sleeve on the shaft of the trimmer or jig and slide the shaft into the tube. You will get an exact 90 degree squared blank every time. The 9 sleeve sizes will insert into tube sizes: 8mm, 11/32 in., 3/8 in., 10mm* , 25/64, 10.5mm, 27/64 in., 15/32 in., 31/64 in., 12.5mm, 33/64 in., 9/16 in., 37/64 in. (some sleeves will work with multiple tubes). Packed in carry case with instruction sheet. Works with barrel trimmers: #PKTRIM7 (5/8 in. cutter), #PKTRIM34 (3/4 in. cutter - recommended) and Pen Blank Squaring Jig #PKSQUARE.. Sleeves are 2-1/2 in.long.