This is a 9V battery clip typically used for our wireless cameras. The ID is 2.1mm, the OD is 5.5mm. Center positive.
9V Battery Snap with 12" Leads
Out of the box, the SyRen 25 motor driver can supply a single DC brushed motor with up to 25A continuously. Peak currents of 45A are achievable for a few seconds. Made by Dimension Engineering.
100 pack of black UV resistant nylon with flexible tape section, pull tight and does not come undone. Length 4 inches.