DRITZ-Thermal Thimbles. Protect your fingers from heat with these thermal thimbles! Designed to fit the index finger and thumb on either hand, these heat-resistant Thermal Thimbles help you press your clothing and fabrics without burning your fingers. These are not intended for use with needles or sharp objects. This package contains three thimbles in different sizes to choose your best fit. Sizes: 1.01 inches, .89 inches and .76 inches. Imported.