5-Slide Unit. Holds 5 single 1" x 3" slides vertically, or 10 slides back-to-back. Slides extend above the opening, allowing for the manipulation of them without the use of forceps. A screw cap has a metal foil liner that withstands stains and organic solvents and it prevents evaporation. Overall measurement: 3 ⅜" H x 2⅜" W base x 2⅜" (dia) top.