25mm micrometer adjusting macro rail featuring a genuine Mitutoyo precision head, Delrin slider block, and 4-position quick release clamp. Hejnar Photo precision aluminum extension spacer block for Metabones Gen 2, 3, and 4 Canon EF to Sony E-mount lens adapters providing extended tripod and L-bracket clearance. Hejnar Photo 8 Inch Lead Screw Macro Rail with Scale