Knife Switch - Single knife, double throw Hand Model Children can create hundreds of

Children can create hundreds of words

Size: 13W×15H×11D inches

style and ovary with eggs can be easily studied

Spring Balance Square Shape

heavy duty and durable iron

Knife Switch - Single knife, double throw Hand Model Children can create hundreds ofSingle knife, double throw. Size: 3. 5 x 7. 2cm. Durable plastic base knife switches that stand up during tough student use. Poles and knives are made of brass for good electrical connections. Premium Quality: This product is made of high grade construction all the way through, excellent build quality and proven reliability across the range. Designed for use in professional laboratories but is an ideal choice for science classrooms and household use.