Wangdd22 5PCS Aluminium Heater Block Assembly for V6 J-head 3D Printer Makerbot MK7/MK8 Extruder Screw Hole M3 20mm x 16mm x 12mm<img src="http://ecx.images-amazon.com/images/I/41WUB8B%2B2AL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41HoCTi1QEL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41%2Bs-eH%2B9FL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41RNvcssccL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41W29C080PL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41XF7FgTBjL.jpg" noproxy>