Seldén T-Base Attachment Loop (508-459) is part of the spinnaker-pole and whisker-pole hardware range used to assemble, control or stow compatible pole systems. T-Base Attachment Loop to be used with 510-161-01 and 510-171-01 mast bases. Dimensions: Ø6mm X 50mm X 24mm This component is best selected by matching the pole diameter, mast fitting and existing connection arrangement rather than by appearance alone. If replacing an original Seldén part, use the article number where available and compare the fitted dimensions before ordering. For a new installation, also check pole travel, trigger or trip-line operation and any vertical stowage requirements.