Collet, 1/8" (3.175mm) Solid Bottom Load Collet For: DE3/EGX350/EGX400/EGX600, Half Round Cutters Straight Through This Holder Collet (Other #21655108) is used in the DE3, EGX-350 and EGX-400/600 engravers. This collet holds the cutting tool used to engrave materials.