Included is a pack of 25 10-32 threaded x .375" long brass thread inserts.
Simply use an arbor press or a pair of pliers to press these into plastic parts - works great for 3D printed parts. When bolts are driven into the insert, they expand and the knurled feature grips into the part.
Maximum hole diameter: 1/4"
Body Length: .335"
Flange - .312" diameter, .04" thickness
Example application - Thrifty 3D Printed Quick Build Clamping Blocks