Model No.:21031
Product Origin:China
Brand Name:Keyi
Price Terms:FOB
Payment Terms:T/T, L/C
Certification:ISO9001
Description:J2121 demonstration block and tackle, J2122 student block and tackle Use: 1st, specially feed the physical teaching in the middle school and natural general knowledge discipline in the elementary school when used in the classroom demonstration or the grouping experiment 2nd, the J2121 demonstration block and tackle demonstrate the pulley tectonic for the teacher, with better mechanical and experimental efficiency 3rd, the J2122 student block and tackle group "the mechanical efficiency" for the student and experiment Structure: 1st, block and tackle wheel disk is made from ABS engineering plastic, to enhance the mechanical efficiency and the use effect; the wheel axle uses the copper nature. The frame and the knot skeleton are made from coal steel cold rolled plate, with superficial chrome-plating 2nd, J2121 each group has a single pulley, 3pc string pulley block 3rd, J2122 each group has a single pulley, 2pc string pulley block