Estes 3158 Regular Engine Mount Kit, 3 Mounts – 19mm Mounts for BT-50, BT-55, BT-56 & BT-60 Model Rocket TubesRegular engine mounts for BT 50, 55, 56 & 60 body tubes Includes enough pieces for 3 mounts. Easy to assemble with complete instructions. Engine mount tubes are a BT20 or 0. 74 in. (19 mm) Plus can be used to make a conversion mount for lightweight D powered rockets

Offers shrink-fit protection and strain relief of wires

Includes Arduino UNO board

LED count: 12 per spotlight

Standard 140 Mpts deep memory

BMP and CSV storage

and the Yellow Swallow

Eight-piece human brain model can be disassembled to provide students with hands-on experience examining the hemispheres

They guard against hand fatigue and have superior tensile strength

Length: 11"

Normal and Single

• Output to 450 MHz on harmonics

Includes 1/4" long taper chisel soldering tip