1/8" thick, mar-resistant, SIZE & FITTING OPTIONS: Oversize windows are at least 2" larger than the window frame. Cutting, trimming, beveling & drilling is required. Trimmed windows are cut to fit into the window frame. Beveling & drilling is required. Pre-cut to fit formed windows are CNC cut to the exact size required to fit into the window frame. Beveling and drilling (with or without countersinking) varies from one application to another. If you need exact specifications for your window, please call.