Prep/Master 4430 Floor Grinding Machine (Electric) Ideal for Polishing Projects up to 20,000 SF (2,000 M 2). The Prep/Master STI-4430 floor grinding machine is an ideal choice for project sizes up to 20,000 SF (2,000m 2).Quite unexpectedly for its weight and size, this grinder is extremely easy to operate due to the smooth operation of the STI rotary gear system.
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