'Other' Constructional and Allied Systems Info & Downloads
Build It Construction Set
The Build It Construction Sets have parts to similar to Eitech Construction and are classified as a Polylong(1) type sets. Not sure where these sets have come from, although they were almost certainly made in China. They were advertised for sale on Ebay in 2020.
Manufacturer / Distributor
ITP Imports WF6 1GY, UK.
Imported from China
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.
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