'Other' Constructional and Allied Systems Info & Downloads
Metal Tech Construction Sets
Metal Tech Construction Sets have many parts to similar to Eitech Construction and are classified as a Polylong(1) type sets. They are manufactured in China for RMS International (An international toy company which originated in the UK in the mid 1980s). Some of their sets also feature the Grafix logo on them - one of the many trade names of RMS International.
RMS International also provide own brand products to many well known High Street stores. Some of which sell Metal Tech construction sets under their own in-house brand names. E.g. The Works (Science Club), B&M Stores (Mechanix(4)), both of which can be found elsewhere on this website.
In general all the coloured parts are made of plastic. The 4 in 1 and 2 in 1 sets can make 4 and 2 models simultaneously.
Manufacturer / Distributor
Made in China for the RMS International toy distributor
Info from the Metal Constructional Systems Database for POLYLONG 
2003 to in production in 2018 and continuing
25 (see comment *1)
4.2 (see comment *2)
Bolts: pan (crosshead)
Steel with a Bright Zinc plated finish
6.5(see comment *3)
Various Sets (see separate list) from Polylong & other makers. Most parts as CONSTRUCTION  but some others. *1 Mod.1 & finer for Motor/Gear Unit.. *2 Square holes in some RCEE sets, see TRONICO [a]. *3 6.1 & 7.4 also reported.
Below there are manuals/leaflets which can be downloaded by clicking on the appropriate image.
Photos of the Metal Tech 2 in 1 motorised bike and car set. The sets contains two electric motors