The Series 3000 High Performance Sliding Door is a stylish, high thermal multi-track sliding door designed for exterior use. This high-performance slider is suitable for either fin or block frame applications, featuring thermally broken stacking head channels and bottom tracks for superior thermal performance, allowing for multiple slider combinations. Its robust construction, coupled with heavy wall stiles and interlocks, results in a truly monumental thermal sliding unit. The door is equipped with a multi-point locking system, heavy-duty adjustable tandem rollers, and a floor track with stainless steel caps to ensure smooth operation over many years of service. AAMA LC-PG25-SD Certified Multi-Locking System for Enhanced Security Durable Stainless Steel Rollers Pre-Assembled, Compatible with 1 (25 mm) Glass Color Black Bronze Anodized Brand Name CRL Manufacturer CRL Material Type Aluminum