How many 5.5mm drill bits x450mm to drill 800 holes.

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Roofer / Carpenter
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Hello. So I have a job where I need to fix 200mm insulation to a hollow beam concret floor. I am putting 6 fixings in each board and need to drill 800 holes. Now my question is how many drill bits will I need and what drill. I am looking at buying the bosch gbh26 d with dust extraction. The fixings are fast fix eg no plugs. And 150mm long. So a depth of a 100mm into the concrete hollow beam.

This post was edited by greatbabybear on 14.03.2021, 20:15 o’clock
Reason: Better title

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Hello. A little up date. I have been using the bosch 5mm 5+, drill bit at 260 mm long.. I am on about 400 holes with same drill bit. But I did buy the GBH 26F with 2 6ah batteries and dust collector. Thought it might of been quicker than my ec brushless as it is 2.6j compared to 1.7j... Not quicker. But I manged 60 holes at a depth of 100mm ish on a single charge. But I have found the handle really comfortably and alot less vibration.