PFERD Fan Grinder 3-Pack 40 x 20mm F4020 Aluminium Oxide 80 Grit 47800134PFERD's aluminium oxide fan grinders are long lasting, durable, and retains its sharpness over time. They are capable of high stock removal due to the aggressive coated abrasive, with high flexibility. For safety reasons, it is imperative to remain within the stated maximum permitted rotational speed at all times with a clamping depth of at least 15mm. Features: High stock removal due to the aggressive coated abrasive This fan grinder achieves its