18mm
Frequently Asked Questions
Has a safety helmet got a lifespan?
Yes – Most of them 3 years
Are bolts identified by their hardness or the markings on them?
All bolts should be marked with their qualities on the hex head
Do high viz vests need to meet a standard?
Yes – for site conditions
Can holesaws be extended in length?
Yes – with a 150mm or 300mm extension
Can we drill rebar in concrete when we hit it?
Yes with a special drill bit in rotary mode
Are there special drill bits for drilling stainless steel?
Yes – Cobalt bits will usually suffice
Do cordless power tool batteries have a ‘memory’?
Most modern batteries do not, however if there are any they will be NI-CAD
Do magnetic drills have to be used on a steel base?
No – they can attached to other materials using suction
How do I establish a drill size for a particular tap?
Subtract the ‘pitch’ from the tap size ie 4mm – 0.7mm = 3.3mm drill bit
What does the term SDS mean?
Developed in Germany it stands for Steken-Drehen-Sicken, roughly translated is `insert, twist, secure’.
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