Metallics J1561 Anchors Sprg Wing TogBt 1/8" #6 3" (Jar 50)

The J1561 is a 1/8 inch (#6) spring wing toggle bolt with a 3 inch screw length. The 1/8 inch refers to the machine screw diameter the wings thread onto, and the 3 inch length is what sets how thick a wall plus fixture it can grip.

That is exactly what it is for. A spring wing toggle is a hollow wall anchor: you fold the wings, push them through a drilled hole, and the spring snaps them open behind the board so the load bears on the back face of the drywall, plaster, or hollow block instead of on the hole itself. The J1561 is the 1/8 inch (#6) version with a 3 inch screw, a common pick for light electrical work such as hanging boxes, straps, raceway, and small fixtures. In solid concrete or brick, use a sleeve or wedge anchor instead, since the wings need an open cavity to spring into.

Each jar holds 50 of the 1/8 inch spring wing toggle bolts, supplied in jar pack. That is a service-van quantity rather than a single-job blister, so it suits a maintenance truck stock or a repeat-install run.

Yes. With any spring wing toggle the drilled hole has to clear the folded wings, not just the 1/8 inch screw, so the hole is noticeably larger than the bolt diameter. Fold the wings flat along the screw and size the bit to pass them. That also means the fixture must be slid onto the screw before the wings go through the wall, because the wings cannot be retrieved once they drop into the cavity.

No, the 3 inch screw works on thin board, it just leaves extra thread sitting inside the cavity, which is harmless. The length matters at the other end: the screw has to pass through the fixture, the wall material, and still leave enough thread for the wings to draw up tight. Three inches on a 1/8 inch (#6) toggle covers thick fixture bases, furring, or doubled board where a shorter toggle would run out of thread.