This is Product is an assembly put together of Stoltz products and Stainless Steel Hardware. This is a 4 inch Stoltz Bow Roller with Stoltz Bells. You can use this product to replace an existing cracked and faded bow roller set-up, or to beef up your current one with the best option on the market. This assembly includes the 4 inch Stoltz bow Roller, the (2) Stoltz Brand Bells, and a Stainless Steel 1/2 inch diameter bolt to mount the assembly. This 4 inch Stoltz Roller Roller with Bell assembly would mount on the front of your trailer in the winch post or winch stand. This is meant to be the contact point for the bow of your boat as you load and unload. In many cases, having the addition of the bells significantly helps guide and direct the bow of the boat the last final inches, ensuring correct placement. In addition, having the bells protects the boats bow front making contact with the winch post arms, which can damage the hull of the boat. Stoltz Brand Products, especially with this set up, wont crack and mark up your boat hull! This is the real deal. Have a Stoltz Brand Polyurethane Bow Roller ensures that you will not have any issues for the remaining life of your boat and trailer. Other rollers with crack, fade, and mark up your boats hull. A damaged bow stop could lead to failure, causing the bow of your boat to hit the winch post. To avoid this, only use Stoltz products, because they simply are the best bang for your buck.