Milwaukee 49-40-6100 4”-5” Universal Surface Grinding Dust Shroud The Milwaukee 49-40-6100 4”-5” Universal Surface Grinding Dust Shroud works universally across most pro-brands, while competitors shrouds are proprietary to their own grinders. The Milwaukee® shrouds feature a durable and lightweight design with a convenient clear window for easy navigation. The purpose of grinder shrouds is to reduce exposure to dangerous debris, crystalline silica, and dust particles that can cause health issues for users who work with stone and concrete.