PK means tooth pitch =3.5mm, 4 means that the belt has four wedge teeth, and 855 means that the effective length of the belt is 855 mm \x0d\x0d\ Vehicle belt model classification: \ x0d \ Common types: O, A, B, C, D, E, 3V, 5V, 8V; \x0d\ General reinforcement types: AX, BX, CX, DX, EX, 3VX, 5VX, 8VX；; \x0d\ narrow v-band: SPZ, spa, SPB, SPC；; \x0d\ Strong narrow V-band: XPA, XPB, XPC；; ; \x0d\ The cross-sectional dimensions of V-belts of each model are specified: the cross-sectional dimensions of V-belts of model \x0d\A are: top width 13mm, thickness 8mm；; \x0d\B V-belt section dimensions are as follows: top width 17MM, thickness10.5mm; ; \x0d\C V-belt section size: top width 22MM, thickness13.5mm; ; \x0d\D V-belt section size: top width 2 1.5MM, thickness19mm; ; \x0d\E V-belt section dimensions are: top width 38MM, thickness 25.5MM. \ x0d \ Corresponding dimensions (width * height): O( 10*6), A( 12.5*9), B (19).