Bring science to life with fun and imaginative toys from Koontz.
Build a combination lock mechanism from strong, easy-to-assemble, precut durable and recyclable cardboard parts and explore how it works.
Warning: Last items in stock!
Instruction leaflet explains the secret behind the solution to this ancient puzzle and suggests ideas to test the lock on friends and family.
Dimensions: 15cm (w) x 23 cm (h) x 3 cm (d)
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