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Slotted-Screw 4-1/4 in Shower Drain Grate
A 108 mm (4-1/4 in) screw-down replacement grate for round shower drains whose original strainer has corroded or gone missing. The two 4.6 mm radial slots take the drain's existing pair of screws anywhere from 70 to 90 mm apart, so you don't need to know the exact spacing. A 9 mm counterbore sinks the heads below the surface, the 3 mm slots catch hair, and the 4 mm plate has a chamfered edge.
Shower Drain Hair Catcher Dome
A 92 mm diameter, 30 mm tall slotted cone that sits over a standard round shower drain grate and traps hair on the outside where you lift it off and wipe it clean, instead of letting it braid into the trap. Thirty 2.6 mm slots pass the water, a 2.5 mm base ring keeps it from rocking, and the 5.5 mm centre bore drops over the grate's existing screw (M5, #8-32 or #10-24) so it cannot slide or float away; the 14 mm knob is the lift handle.