I have uploaded pictures on the following Link
Link
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plus.google.com]
Dimensions
Square cross sectional block - 19 mm by 19 mm.
External Rod Dimensions ( PEEK ) - 16 mm.
Holding Dimensions - 4.5 mm length - 12 mm internal dia.
nozzle extrusion dia - 0.35 mm.
Total length - 55 mm.
Fits exactly Prusa i3 holder.