Schlegel Operators Devices, QUARTRON L-JUWEL Series Dimensions (mm) Mounting dim: 16.2 Min. mounting grid: 25 x 50 Front bezel dia: 25 x 50 Front bezel height: 12 Catalog (PDF-10Pg) This is the flush mount variation of QUARTRON with particularly large push-cap area. 16mm mounting hole with flush rectangular bezels. Suitable Contact Blocks A-SERIES Features: 6mm travel Lamp socket T5.5K (telephone slide base) Connection = Fast-on terminals 2.8x0.8mm C/P-SERIES Features: 3mm travel Lamp socket T5.5K (telephone slide base) Connection = PCB mount terminals