Save with this combo pack! You get one Lathe Mounted Squaring Jig and One 9 Piece Barrel Trimming Set. With the Lathe Mounted Squaring Jig, you can now you can square your pen blanks right on your lathe! It is a quick, easy and accurate lathe mounted pen blank squaring solution so you no longer need your disc sander to square your pen blanks. The system includes a headstock sanding disc assembly, an easy to change 80 grit hook and loop mesh sanding disc, and a lathe mounted squaring jig support. The jig support easily adjusts so you can sand anywhere on the disc. The included squaring jig is the same design as our popular #PKSQUARE sanding jig so you can safely sand any tube diameter without the risk of tearout. You can quickly remove the jig support to use your lathe without interference. The system adapts to split bed lathes with 10 in. to 14 in. swings. With the 9 Piece Barrel Trimmer you can Barrel Trim any Pen Kit with any tube size. 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.