1" bore with 1/4" keyway. For 1-3/16" wide belts. Contains six 206514A pucks and 205858A pink spring. Often used on early models of Ski-Daddler, Sno Pony, etc. This bore size and calibration is for 4-cycle engines such as Tecumseh, Kohler, Briggs & Stratton, etc. 1800rpm engagement.