Kundenbewertungen für VEVOR Kernbohrer Bohrkrone φ 102 mm 241 mm Bohrtiefe, M16 Innengewinde, Trocken-Diamantkernbohrer Kernlochbohrer mit 3 Adaptern Pilotbohrer Sechskantschlüssel für Stahlbeton Ziegel Mauerwerk

The pilot bit is too short to fit through the end of the core drill. It's very hard to get started without "wondering". The pilot bit is also of very poor quality.

The bit works better than expected but not perfect. I drilled though 2 - 8" thick 40 year old concrete walls. The bit still has life in it. Be aware that cordless hammer drills will work with this, but they will struggle and it will be slower. When I switched over to a corded electric hammer drill, it worked much better. Now the not so good part. The pilot bit is not long enough to be a pilot bit. I used a small concrete bit and drilled holes around the parameter with that to give me a deep enough groove to get started. Once I had a groove it was easy to continue. Every inch or so I stopped, let everything cool and chiseled the center out of the hole to prevent unneeded friction. I good pair of leather gloves are a must. It is long enough where I found I needed to loosely hold the bit while starting out.

The work was done on a church that had one foot thick cinder block plus drywall and 2x4s on their sides and this bit went completely through all of it it is a little rough in the beginning because the starter bit is not stick out far enough past the front to give you a pilot start but once it does start it goes completely through it I made several penetrations through the walls to add plumbing worked as designed for the price and its capabilities you can't go wrong

Pas encore utilisé mais ça a l'air plutôt solide pour l'instant

提供的中心转头应该是开转时准确定位用的吧，它应该比转筒长一点才对呀。你们提供的却是短一截的。这是啥意思？

Appena la provo vi dirò come funziona

The Core bit was adequate for the job. Used to drill two holes in lime stone.

Bohrsystem entspricht nicht ganz den Erwartungen. Beim Arbeiten mit Schlagbohrmaschinen löst sich ständig die Befestigungsschraube des mittleren Leitbohrers und fällt heraus. Bohren wird dadurch uneffektif weil die Befestigungsschraube immer neu gesucht, neu eingeschraubt und der Leitbohrer wieder neu befestigt werden muß. Die Lösung mit Madenschrauben scheint suboptimal weil über den Sechskantschlüssel nicht genug Klemmkraft aufgebracht wird.

Nass bohren funktioniert, trocken nur leider gar nicht, da er zu schnell erhitzt. Doch um den Preis, zum nass bohren, zu empfehlen.

Purchased this set 25mm to 152mm hole saws. It did not include the adaptor. I do not see it .on your website. Can you help me with this.i can’t use them without it