Looking to buy new fork, can you tell me what those two dimensions represent ?

Point Trekking-Fork - 28" - A - 1" / 230 mm - B - 70 mm
Point Trekking-Gabel - 28" - A - 1" / 240 mm - B - 130 mm
Point Trekking-Fork - 28" - A - 1" / 185 mm - B - 70 mm