The size is 147 55.5mm(diameter thickness) and it can hold the cable :0.75mm2, 1.0 mm2, and 1.5mm2. The max retractable length of 0.75mm2cable is 4.8M, hold the current of 8-10A. The max retractable length of 1.0mm2cable is 4.4M, hold the current of 10-13A. The max retractable length of 1.5mm2cable is 3.5M, hold the current of 13-16A. Fixed end cable length, normally is 0.5M, but it can be customized based on your requirement. And for the plugs and connectors on both retractable end and fixed end can be customized based on your requirements.Attached is some project we had made for reference. Hunan Xutons Metal & Plastic Co., Ltd(DYH Barrier Enterprise Co., Ltd) is comprehensive manufacturer for retractable power cable reel, retractable signal cable reel, retractable steel cable/ribbon wire/nylon wire recoiler and various of retractable&security items. DYH is a specialist in the automatic retractable system for more than 15 years. DYH has design team and R&D Department for customize, QC department with full testing equipment, cooperated with many global brands for years and there are agencies in Europe and North America. For retractable items the key component is inside spring which decides it retractable mechanism and using life. We start from doing spring and provide spring for Chinese fastest train, so quality can be guaranteed. DYH take advantage of our advance technology in retractable area, not only make retractable items but also provide solution for wide application of retractable items. No matter what field you are in, we have the right solution for you. In fact, 80% of our retractable system solutions are customized according to customer needs. Contact with DYH for customized.