These are the black plastic inserts that fit on the lower front of some Polar backgauges and keep the sheets from slipping underneath. Each body comes with a wedge for mounting. Same as part 247273 or ZA3.247273. Sold in pkg of 1

These backgauge sliders fit on the ribs of Polar backgauges where it meets the bed. Our version uses a screw instead of a wedge to expand the body for mounting. No wedges to lose or crush when mounting and these can sometimes be re-used if knocked off.
Replaces Polar part number 247273 or ZA3.247273 and is 6mm wide.
Sold in package of 1.