Magnetic steel tools have the ability to be unexpectedly launched through the air causing serious injuries and significant damage to expensive MRI equipment. - Using MRI-certified nonmagnetic tools helps protect employees and equipment for maintenance and repair work. Bristle Material / Phosphor Bronze Number of Rows / 4 Brush Length / 1 1/2 in Brush Width / 1/2 in Handle Length / 10 in Handle Type / Curved Handle Material / Wood Trim Length / 1/2 in Overall Length / 10 in