The 3 hole connector block holds up to 30 wires. The 2 hole connector blocks holds up to 20 wires. Each position accepts two wires no screws needed just push into the flexible plastic shell. size: for 2 Hole: Approx 20 x 17 x 14mm(L W H), 3 Hole: Approx 26 x 20x 14mm(L W H).
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