The SMO256-9-M marker type can be used with SMKH or SMOH holders or directly on cable. It is installed quickly onto the SMKH or SMOH holder, which is fastened with cable ties around the cable. It is made of cadmium- and silicone-free rigid PVC. The recommended wire diameter is 0.147 - 0.256 inches. The marker's marking is the letter M and is black. It is packaged on a compact disc.