Stanley Surform Blade Fine cut 140mm Grey SKU: 251311 MODEL: 5-21-398 Error. try again later You've successfully joined the club $ 13 .84 each Available on orders $50 to $1500. More info × Mitre 10 Variants For use on all types of wood, aluminium,copper, plastics, and laminates. Features and benefits Replacement surform blade. 5-21-398 fits 21-399, 21-102 and 21-104. For fine finishes on hard wood, end grain and some soft metals.