620 pcs male and female JST SM connectors assortment kit for DIY projecteasy to use just put the crimps in the tool and press them make the crimp the insulation are all the way toward the wire. Premium quality ,the crimp pin connector made of durable plastic and metal tin plating internal pure copper to increase the conductivity and the surface coating antioxidant increase the life JST SM 1 / 2 / 3 / 4 / 5 / 6 pin terminals, 18-26 AWG wire, pin pitch: 2.54mm,these jumper wire pin connectors are compatible with arduino and breadboard style pin connectors and sockets, like 3d printer boards etc Pakcage include 200 pcs female crimp pins; 200 pcs male crimp pins; 10 pcs 2x6p, 10 pcs 2x5p, 10 pcs 2x4p, 10 pcs 2x3p, 10 pcs 2x2p, 20 pcs 1x6p, 20 pcs 1x5p, 20 pcs 1x4p, 20 pcs 1x3p, 40 pcs 1x2p, 50 pcs 1x1p dupont cable jumper wire pin header ALL come in a clear plastic storage box with 11 divide cells each is in suitable size for pin housing connector and male female dupont crimp pins always keep compact and organized