Adjustable Sliding Hook: This could refer to a hook that can be moved along a rail or track, allowing you to adjust its position to accommodate various items. These are often used in storage systems for tools, or other equipment.

Adjustable Hanger Hook: In some cases, people use hangers with adjustable hooks for hanging clothing. These hooks can be moved up or down along the hanger to accommodate different sizes of clothing or to maximize space in a closet.

Sliding Rack with Hooks: This could refer to a rack or bar with adjustable hooks or hangers that can slide along the length of the rack. Such racks are used for organizing items like kitchen utensils, pots and pans, or gardening tools.