This is Window's replacement sprocketnose tip for Carlton (formally known as Windsor) Speed Tip chainsaw bars. These noses will also fit Sandvik Speed Tip chainsaw bars. Nose is removed by punching or drilling out 5 rivets. Speed Tip sprocketnose assembly comes complete with 5 rivets and instructions. Tip works with all gauges (.050, .058, .063). Requires a hammer and punch to install.