1. The curved end allows easier movement through concrete without resistance, preventing sticking or snagging. 2. The curved end of the trimmer and the rounded edge of the joint router enable smoother movement in concrete without pulling or catching. 3. Stainless steel ensures long lifespan, stable performance, and low maintenance. The rubber grip features an ergonomic design for a firm, comfortable hold and reduced fatigue. The seamless stainlesssteel structure ensures fine smoothness and clean cuts. 4. Manual concrete edger made of stainless steel (15.2 x 7.6 cm, 1 or 5.1 cm R) and groover (15.2 x 7.6 cm, 1 or 2 inch, 1 or 2 inch D). Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store