The 211B-N four star heat- resistant brush is 4.5 long and .25 diameter handle with .5 long and .254 wide bristles. The bristles are impervious to solvents and common chemicals, as well as bacteria. They are heat resistant to 250F.Specs amp; FeaturesHeat Resistant, Autoclavable, Application: Heat resistant to 250F., Quality: , Surface Resistivity : Insulative, Shape: Straight, Material: Acetal Handle wNylon Bristles, OAL: 4.5 (112.5mm), Body Width: 0.25 (6.25mm), Body Height: 0.25 (6.25mm), Tip Width: .5 (12.5mm), Tip Height: .25 (6.25mm)