Metal roller designed for smoother thread release and reduced friction, improving control during string serving. Bowstring slot engineered for fixed positioning and easy alignment. Suitable for archers, enthusiasts, and beginners; versatile tool that supports consistent performance across skill levels. Compatible with most string serving materials; lightweight construction for easy handling. Durable aluminum body with adjustable tension control to accommodate various bowstring serving needs. This tool is a practical addition to any equipment kit, combining reliability with straightforward operation. Practical use scenarios Starting a bowstring or reserving an existing one to ensure consistent tension and precise alignment. Switching between different string serving materials while maintaining proper seating and minimizing fraying. Routine maintenance sessions to finetune tension for improved string longevity and shooting accuracy.