We provide all types of expansion apparatus that consist two uprights made of cast-iron and measuring 18 cm in height. These apparatus are further connected by two rods that are fabricated using nickel. Having a length of 38 cms, these rods provide support to the apparatus. These apparatus are fixed to one of the upright rods and rest on a friction pointer that is positioned at the other. Scaling between 0 to 90 deg can be done with these apparatus. We offer all types of aluminium, brass and iron expansion bars to our customers.