Lightly Used Shopsmith 520 / Mark 7 Upgrade fence + straddle block for your Mk V Shopsmith 510 saw table. Included are a 520 / Mark 7 dual locking fence and straddle block. The fence has a cosmetic mark on right top edge midway on the fence, that doesn’t affect function or use. All 4 fence T slot. Tracks and fence faces otherwise look near new and scratch free, as do the fence dual lock mechanisms. Everything was stored for 10 or more years. To the best of my knowledge, 520 rails and fences are only. Compatible with model 510 aluminum saw tables. Requires 520 or Mark 7 fence rails. Saw table rails are in listing #.