LIGHTWEIGHT SINGLE-COIL DESIGN: Engineered for tilt-style single-hung and double-hung windows, the WRS Series 37 QuickTilt Single Coil delivers precise counterbalance and smooth sash control for lighter sashes. This product features a #9 Right Hand coil rating and supports 17–18.99 lb sashes. The compact constant-force coil delivers quiet, friction-free lift—ideal for standard residential windows requiring dependable, effortless operation. Left-hand balance sold separately. CONSTANT FORCE SPRING TECHNOLOGY: This coil spring balance uses a constant-force mechanism that maintains steady tension throughout sash travel—no pulleys or cords to wear out. The result is smooth, consistent window operation and extended component lifespan. DURABLE AAMA CLASS 3 QUALITY: Built from galvanized steel for corrosion resistance and long-term strength, each QuickTilt balance is AAMA Class 3 verified and precision-tested through thousands of open-close cycles. Coil housing measures 1-9/32″ wide with a 17/32″ coil spring for a precise, reliable fit. PRE-ASSEMBLED FOR EASY INSTALLATION: Arrives ready to install with the coil and pivot shoe pre-assembled, fitting directly into standard tilt window tracks. Designed for DIY or professional repairs, it offers fast, accurate setup and long-term dependability. TRUSTED SINCE 1989: WRS Window Repair Systems has over 30 years of experience supplying reliable, high-quality hardware. Trusted nationwide by homeowners, contractors, schools, and property managers for dependable repairs and long-lasting performance. Restore your windows to effortless, reliable performance with the WRS Series 37 QuickTilt Coil Spring Window Balance—engineered for lasting strength, smooth lift, and consistent sash control. The WRS QuickTilt Series 37 uses constant-force coil technology to provide smooth, friction-free movement through thousands of open-close cycles. Designed primarily for residential tilt windows yet versatile enough for light commercial or institutional applications, it eliminates the cords and pulleys found in traditional systems—offering quiet, dependable operation for years. Each balance arrives pre-assembled with the coil and pivot lock shoe, ready for fast, secure installation. Choose between Single, Tandem, or Triple Coil configurations to match your sash weight—from light residential windows to heavier frames. Crafted from galvanized steel and verified to AAMA Class 3 standards, it resists rust and wear while maintaining consistent performance across every cycle. Built to fit most standard tilt-style vinyl, aluminum, and wood windows, the QuickTilt Series 37 features a 17/32″ thick coil spring housed in a 1-9/32″ wide case for precision alignment and long-term reliability. How to Select the Correct Balance: Determine sash weight by weighing the window or checking the stamp on your balance. Each unit includes both the coil and pivot lock shoe. Measure only the metal housing to confirm size. Replace both balances in the same window for smooth, even lift. Important Notes: Sold individually unless otherwise noted. Compatible with the WRS Series 37 Constant Force Tamper Lock – Black. Replace balances in pairs for best performance. Upgrade your windows with the trusted performance of WRS—where precision, quality, and durability meet effortless function!