These fit on square m18 batteries. (1) Plastic Battery Holder. Patent Pending Design .
STS Auto Design MW1868HO – Milwaukee M18 Hi Output 6.0Ah/8.0Ah Magnetic Cover
STS Auto Design MW1218 – Milwaukee M12/M18 Battery Charger Magnetic Holder
STS Auto Design MW1218RC – Milwaukee M12/M18 Rapid Charger Magnetic Holder
STS Auto Design MW1830HO – Milwaukee M18 Hi Output 3.0Ah Magnetic Battery Cover
STS Auto Design MW12HO – Milwaukee M12 High Output 5.0 Magnetic Battery Cover
STS Auto Design SN144 – Magnetic Battery Cover for Snap-On 14.4V Tools