Staedtler Mechanical Pencil Eraser Refill for Drafting Pencils 925 (92R) Staedtler Mechanical Pencil Eraser Refill for Drafting Pencils 925 (4mm diameter, 5pcs) For 925, 925 25, 925 35N, 925 65 (no good for 925 25-20,925 35-20N) 92R