Allows for easy loading of the chambers of a cylinder when removed from gun. The .36 cal fits Pietta model 1851, 1873 and 1858 models Will not fit .31 caliber cylinders. The .44 cal. fits all 1851 and 1860 Colts and 1858 Remington. Cylinders are not included. (AT THIS TIME WE ARE STILL WAITING FOR SHIPMENT FROM MANUFACTURER ON THE .44 CAL. SORRY)