Pilot eraser dimensions:
ES-10 = Diameter 6.8 mm, length 12.5 mm HERF-10 = Diameter 4.9 mm, length 12.5 mm HERFS-10 = Diameter 4.2 mm, length 12.5 mm HERFL-10 = Diameter 5.9 mm, length 14.0 mm HERFF-10 = Diameter 6.8 mm, length 10.5 mm HERF-10BK = Diameter 7.4 mm, length 7.0 mm HERFN-10 = Diameter 4.8 mm, length 13.7 mm HERFNS-10 = Diameter 4.8 mm, length 7.3 mm