Tillett STRi (was TR1) Adjustable Seat Runner sets are made to be used in conjunction with car seats B1, B2, B4 when using the TB1 brackets and the B5 when coupled with the TBB5 (was TB2) brackets. It can also be used under the PTBi (was TBF1) brackets when using seats B6F, B6F XL and B7 and when fitting the B5 seat coupled with TBB5 (was TB2) or TBB5T (was TB3) brackets, turned under the seat. When using the B6 with bottom mounts and directly mounting the STRi runners to the seat without brackets, a special fitting kit (TK5) with extra spacers is needed.Provides 25cm of leg length adjustmentFits to Tillett TB1, TBB5, TBB5T, and PTBi seat mountsIdeal for road car applicationsDouble locking mechanism for safetyThe STRi runners allow the seat to be easily moved forwards and backwards within the car, making adjustments for different drivers simple.Comes complete with fitting kit. The weight of the adjustable runners set is 1.28 Kg.