Dorma® Standard Type Mechanical Glazing Channel is a Dri-Fit® channel for glass that requires no wet silicone glazing. The two piece mechanical/clamp on the channel with clip-on cover is used to accommodate suspension or load requirements. Bored holes every 11-13/16" (300 mm) on centers. Extruded and electroplated or anodized aluminum end caps finish off the ends of the extrusions with a radius profile and attach with a single countersunk screw. Note: No holes are required in the glass. Channels, Clamps, Clip-On Covers, and End Caps are all sold separately. Important Notes: STRUCTURAL DISCLAIMER - All customers who in any way utilize this product are solely responsible to consult a structural engineer to determine the suitability of the product for the intended use and site conditions. All installers must be qualified and have professional knowledge about compliance with local, state and federal regulations, safety factors, and the appropriate choice of fixing material and procedures.